Improvement in steam-forts of steam-engines



atmt @like a HAMPTON'R. .OAMFIELD, OF SUSQUEHANNA DEPOT, PENNSYLVANIA, ASSIGNOR TO HIMSELF, JOHN H. FITZ SIMMONS, AND GEORGE BOYD, OF SAME PLACE.

Letters Patent No. 85,278, dated December 29, l1868.

n I IMPROVEMENT IN STEAM-PORTS QF STEAM-ENGINES.

The Schedule referred to in these-Letters, lParam'. -and :making part of the same.

To all whom it may concern Be it known that I, HAMPTON R. Cniimmnn, of Susquehanna Depot, in the county of Susquehanna, and State of Pemisylvania,.have invented a new auduseful Improvementon the Valve-Seats of theOylinder of Steam-Engines; and I do hereby declare that the fol-l lowing is a full, clear, and exact description of the construction of the same, with its operation also, reference being had to the annexed drawings, making a part'of this specification, in Which- Figure -l .is a top View of an ordinary steam-cylinder.

, Figure 2, a sectional view of the Same, with the valve in place.

Figure 3 represents the auxiliary or liberating-valve,

which suddenly and promptly releases the exhausted steam from the cylinder C, after lhaving performed its office of moving the piston P to the extremity ofthe cylinder.l

This releasing-valve consists of a plate of metal, shown at F. Each end of said plate, on one side, is extended to form pins, upon which ittlnoves or oscillates in appropriate bearing, properly secured Within the ports on steam-passages D.

E is the exhaust-port, leading to theopen air. l

A is the ordinary Aslide-valve, traversing. the valveseat B.

The vauxiliary valves F F, vibrating or moving upon their bearings y y, fall or lie toward the exhaust-port vE,'upon a ledge or step,shown in the drawing, and

which prevents them from dropping into the port D, also ai'ording a comparatively steam-tight joint when in a state of inaction. r

The operation ofthi's improvement is as fellows: y .When the piston has neared the end of its stroke,

(the steam following expansively,) the valve A is rap-v idly moving in the opposite direction, to release the spent steam, and thus prepare the cylinder for the return-stroke. This release takes place when the exhaustcavity has reached a point over the hinge of the/valve F. Theweight of the valve' 'A being removed, the steam in the cylinder throws up the valve F in its passage to the outer air. v

By properly proportioning the-lap inside and out side )v of' the common slide-valve A, the exhaust takesV When this last-mentioned valve is returning, to re l lease the end of the cylinder now'iilled with steam, the exhaust-cavity strikes the valve F, forcing it easily and naturally down to its first position againstthe ledge'.

The advantagel gained bythe use of the auxiliary valves, is prompt and thorough release of the steam at the exact moment when itis no longer required.

What I claim as my invention, is-

1. The construction of releasing-devices F, having two or more bearings or hinges, substantially as described.

2. The combination of the dewlce F with the seat B and valvel A, asset forth.

HAMPTON R. OAMFIELD.

-Witnesses: v

JOHN H. Fl'rz Smmrons, G. W. BOYD. y -1 

